If this is for a game asset (like the in GTA or a custom unit in Command & Conquer), the "feature" usually involves adding specific behaviors to the vehicle/entity:
Implement a script that transitions the aircraft between hover mode and forward flight mode. hydra.rar
A feature that splits the workload of a single password list across multiple machines. If this is for a game asset (like
A quick-checksum feature to ensure the archive hasn't been corrupted during download. hydra.rar
If you are working with the (often used for Python/Machine Learning research) and your .rar contains config files:
If you are building a tool for the file itself (a .rar handler):